A 19-year-old accused of stabbing his younger brother and sister to death before attacking his father later told police he decided to kill his family “so that he could be alone,” according to court documents.

Malik Murphy was arrested early Tuesday morning at 912 Carlisle St. after the attacks on his 5-year-old sister, Sophia, and 7-year-old brother, Noah.

Both of them died at a hospital.

Their father, Jefferson Murphy, 42, was being treated at the hospital for a stab wound to the neck after the incident, which was reported at 1:11 a.m.

According to an arrest affidavit obtained by KOAA-TV and the Gazette, Jefferson Murphy said he was asleep when he awakened to the screams of one of his younger children. He ran to the basement of the family’s home, where he said he was confronted by Malik, who began stabbing him in the neck, according to the affidavit.

Malik Murphy’s 5-year-old sister Sophia and 7-year-old brother Noah died at the hospital, according to Colorado Springs Police.
Malik Murphy’s 5-year-old sister Sophia and 7-year-old brother Noah died at the hospital, according to Colorado Springs Police.

The elder Murphy pushed Malik Murphy into the garage and held him there until police arrived.

According to the affidavit, Malik Murphy told a detective that he often experiences “homicidal ideations” and that he decided he “wanted to be alone in the residence.” So he took the knife, which he’d purchased several months earlier, and began stabbing his sister, who was sleeping, according to the affidavit.

“Malik Murphy stated that his plan was to kill his entire family and then bury them in the back yard, and this would allow him to be alone in the residence,” a detective wrote in the document.

Malik Murphy was being held on suspicion of two counts of first-degree murder and one count of attempted murder.

The young man’s grandfather said he’s “lost for words.”

“I pray to God he gives me the strength to carry on,” Terry Mason, the maternal grandfather of the children, told 9Wants to Know.

Mason said he had “no idea” why his grandson would attack his family.

“Malik couldn’t get a grip on what life is about,” Mason said. “He had his thoughts. He was just a quiet kid. He was a trouble for them. He had anger issues.

“He was lonely, he needed to talk to somebody, he’d call.”

Malik Vincent Murphy, 19, faces charges for two counts of first-degree murder.

Mason said he and Malik would babysit the younger children.

“He loved them and Noah,” Mason said. “He was very protective of his siblings.”

Mason told 9NEWS that Malik felt like life wasn’t fair to him.

“He was angry towards society,” Mason said. “He felt he didn’t fit in. Toward the family, he was a very loving guy.

"Loved him to death. I wish him well.”

Contact 9NEWS reporter Kevin Vaughan with tips about this or any story: kevin.vaughan@9news.com or 303-871-1862.